A nut having a sleeve portion on its under side, which can be crimped or clinched to hold the item in place when inserted in a hole.
NSN 6610-01-510-2302
NSN 5920-01-191-9847
NSN 5985-01-441-2998
NSN 6145-01-441-2630
NSN 5930-01-056-0218
NSN 6105-00-519-0829
NSN 2925-01-364-7926
NSN 6645-01-487-4341
NSN 5965-01-440-8257
NSN 5930-00-733-9649
NSN 5985-01-390-7953
NSN 5835-00-912-5656